its not that terrible, guys. He's building the motor, so the compression doesn't matter, it will be lowered. The ITR head has better flow characteristics than the gsr one, not to mention the IM. I certainly wouldn't waste my money on the b18c5 as a turbo motor, but just because its a "type R" motor doesn't mean its stupid to boost it... Just means you have to take a few precautions first (and spend an extra G or two h: )